Install Vapor Barrier or Not Install...Advice Please..

Well I made my goal today to get the old floor torn up on the Chicken Coop, get some pics and post for advice before i put down a vapor barrier.. (or maybe not)

The Pics show the original floor and rotted joist and particle board flooring.

Am I correct to lay down 6 mil plastic over the dirt or is this not necessary in this application? I am not sure what I will do with the building when I get done with it, a cabin, garden shed, perhaps? Should I put rigid foam board in between the joist???

I will be using treated lumber for the floor joist on top of the vapor barrier unless i get advice not to use treated lumber.

Any suggestions on proceeding with Vapor Barrier and insulation will be greatly appreciated.

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Install Vapor Barrier or Not Install...Advice Please..

I would dig out under those joists and block them up using Pressure Treated lumber for the blocks, and, yes, use 6 mil under the concrete as well as against the joists. No wood to concrete without a membrane.

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Install Vapor Barrier or Not Install...Advice Please..

Moisture will rise through the flooring and continue to create a humid interior unless you put down a vapour barrier first.

If you had particle board there, that's probably the reasoon it disintegrated (it doesn't like humidity) and I'd look for another subfloor material.

Then you can do what you want with the flooring - insulate it if you will be heating, or just want to walk around in bare feet - Some people might say use treated lumber, some no way. I would, for the joists. Cover that with OSB or plywood...

But I'd also have a look at the walls, there seems to be rain coming in...? wrap that in Tyvek or something to keep the bulk of the water out...

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Install Vapor Barrier or Not Install...Advice Please..

Moisture will rise through the flooring and continue to create a humid interior unless you put down a vapour barrier first.

- Some people might say use treated lumber, some no way. I would, for the joists. Cover that with OSB or plywood...

But I'd also have a look at the walls, there seems to be rain coming in...? wrap that in Tyvek or something to keep the bulk of the water out...

Yup....Ill be laying a vapor barrier down, sealing it good, using treated floor joist and 3/4 inch plywood for the floor. I was wondering about the staining on the walls... I do plan on residing the building and will definatly be wrapping it in tyvek. Ill attach some pics when i get the joist in.